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Issue 5, 2005
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Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm

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Abstract

Photoelectron imaging and time of flight mass spectrometry are used to study the multiphoton ionization and dissociation of pyrrole and its cation following excitation at 243 nm and at 364.7 nm. Our results confirm the 8.2 eV ionization potential of pyrrole and the 9.2 eV ionization threshold for forming the 2B1 first excited state of the cation. Prompt photolysis of the N–H bond in neutral pyrrole following one-photon excitation to its 11A2 neutral excited state is inferred from analysis of the two-photon photoelectron spectrum recorded at 243 nm, confirming the findings of recent translational spectroscopy studies. Facile dissociation of the pyrrole cation is also observed following excitation at 243 nm; analysis of the fragment cations indicates the operation of a complex dissociation mechanism involving dual bond fission and possible migration of the H atom originally bonded to the nitrogen heteroatom.

Graphical abstract: Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm

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Publication details

The article was received on 12 Oct 2004, accepted on 23 Dec 2004 and first published on 18 Jan 2005


Article type: Paper
DOI: 10.1039/B415766D
Citation: Phys. Chem. Chem. Phys., 2005,7, 892-899
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    Photodissociation and photoionization of pyrrole following the multiphoton excitation at 243 and 364.7 nm

    Alrik. J. van den Brom, M. Kapelios, T. N. Kitsopoulos, N. H. Nahler, B. Cronin and M. N. R. Ashfold, Phys. Chem. Chem. Phys., 2005, 7, 892
    DOI: 10.1039/B415766D

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